Roku and Dish Network? Is this a thing?

I heard a few things that got my attention but having a hard time getting good info. Is anyone using a Roku Streaming device to access their Dish Network content? Reason I ask, is I'm trying to setup Dish Network, Netflix, and "Plex" on a TV for someone who is not all that tech savvy. I was going to just use a second HDMI input for the RoKu and Keep the Dish input the same. But is there a way to just use the Roku device to access shows on Dish Network? I though if this was possible, it would be easier for this person because they wouldn't have to go back and forth between inputs.